Electromagnetic wave shield material composition and electromagnetic wave shield product including such material composition

Abstract

An electromagnetic wave shield material composition and an electromagnetic wave shield product including such material composition are disclosed, which may be used on an electric or electronic device such as a portable telephone so as to attenuate or shield any electromagnetic waves generated therefrom. Specifically, the electromagnetic wave shield material composition comprises a primary element including a mixture composed of 10 to 90% by weight of silicon resin and 90 to 10% by weight of baked ceramics material, and a secondary element including a mixture composed of aluminum powder and stainless metal powder. Alternatively, the secondary element may include a mixture composed of paint, aluminum powder and/or stainless metal powder. The electromagnetic wave shield product has the form of a thin sheet of 0.5 mm to 2.0 mm thick, formed by shaping the above material composition such as by press. Alternatively, the thin sheet may have an additional thin aluminum film layer deposited on one side thereof.

What is claimed is: 
     
       1. An electromagnetic wave shield material composition comprising: a primary element including a first mixture composed of 10 to 90% by weight of silicone resin and 90 to 10% by weight of baked ceramics material; and   a secondary element including a second mixture composed of aluminum powder and/or stainless metal powder.   
     
     
       2. An electromagnetic wave shield material composition comprising: a primary element including a first mixture composed of 10 to 90% by weight of silicone resin and 90 to 10% by weight of baked ceramics material; and   a secondary element including a second mixture composed of aluminum powder and/or stainless metal powder, said secondary element having the proportion of 3 to 10% by weight with regard to said primary element.   
     
     
       3. The electromagnetic wave shield material composition as defined in claim 1 or 2, wherein said second mixture includes 10 to 90% by weight of aluminum powder and 90 to 10% by weight of stainless metal powder. 
     
     
       4. The electromagnetic wave shield material composition as defined in any one of claim 1 or claim 2, wherein said stainless metal powder is at least one selected from the group consisting of platinum powder, platinum compound powder, stainless steel powder, titanium powder and magnesium powder. 
     
     
       5. The electromagnetic wave shield material composition as defined in claim 1 or 2, wherein said baked ceramics material is at least one selected from the group consisting of granite, basalt, and sand, and wherein said baked ceramics material is obtained by baking said granite, basalt and/or sand at 650 degrees ° C. to 1200 degrees ° C. for six or more hours and allowing the same to cool to the ambient temperature, and by repeating the preceding steps at least one more time under the same conditions. 
     
     
       6. An electromagnetic wave shield thin sheet comprising the electromagnetic wave shield material composition as defined in any one of claim 1 or 2. 
     
     
       7. An electromagnetic wave shield thin sheet comprising the electromagnetic wave shield material composition as defined in any one of claims 1 or 2, said thin sheet having a thin aluminum film layer deposited on one side thereof. 
     
     
       8. An electromagnetic wave shield material composition comprising: a primary element including a first mixture composed of 10 to 90% by weight of silicone resin and 90 to 10% by weight of baked ceramics material; and   a secondary element including a second mixture composed of paint and at least one selected from the group consisting of aluminum powder and stainless metal powder.   
     
     
       9. An electromagnetic wave shield material composition comprising: a primary element including a first mixture composed of 10 to 90% by weight of silicone resin and 90 to 10% by weight of baked ceramics material; and   a secondary element including a second mixture composed of paint and at least one selected from the croup consisting of aluminum powder and stainless metal powder, said secondary element having the proportion of 3 to 10% by weight with regard to said primary element.   
     
     
       10. The electromagnetic wave shield material composition as defined in claim 8 or 9, wherein said second mixture includes 10 to 90% by weight of paint and 90 to 10% by weight of aluminum powder or stainless metal powder. 
     
     
       11. The electromagnetic wave shield material composition as defined in claim 8 or 9, wherein said second mixture includes 10 to 80% by weight of paint, 10 to 80% by weight of aluminum powder, and 10 to 80% by weight of stainless metal powder. 
     
     
       12. The electromagnetic wave shield material composition as defined in any one of claims 8 or 9, wherein said stainless metal powder is at least one selected from the group consisting of platinum powder, platinum compound powder, stainless steel powder, titanium powder, and magnesium powder. 
     
     
       13. The electromagnetic wave shield material composition as defined in any one of claims 8 or 9, wherein said baked ceramics material is at least one selected from the group consisting of granite, basalt and sand, and wherein said baked ceramics material is obtained by baking said granite, basalt and/or sand at 650 degrees C to 1200 degrees C for six or more hours and allowing the same to cool to the ambient temperature, and by repeating the preceding steps at least one more time under the same conditions. 
     
     
       14. An electromagnetic wave shield thin sheet comprising the electromagnetic wave shield material composition as defined in any one of claims 8 or 9, wherein it is shaped into a thin sheet by using electromagnetic wave shield material composition. 
     
     
       15. An electromagnetic wave shield thin sheet comprising the electromagnetic wave shield material composition as defined in any one of claims 8 or 9, said thin sheet having an thin aluminum film layer deposited on one side thereof.